Stern-bearing.



J. B. STELZER.

STERN BEARING.

APPLICATION FILED APR. 26, 1913.

1,098,187. Patented May 26,1934.

M, 7 s i I 4 /7 1 J b 9 /0 m 7 3P? V I 1 l7 l 6 gnpemio'o MM 3 5822?i/bneooeo extending flange 3 bolted JOHN B. STELZER, OF MIAMI, FLORIDA.

STERN-BEARING.

Specification of Letters Patent.

Patented May 26, 1914.

Application filed April 26, 1913. Serial No. 763,818.

This invention relates to improvements in bearings and hasparticularapplication to stern bearings for the propelling shaft ofboats and other water craft.

In carrying out the resent invention, it

' is my purpose to provide a bearin of the class described whereby thepropel er shaft will be held in proper osition and a fluid.

tight joint effected at t e point where the shaft leaves the boat.

It is also my purpose to provide a stern bearing for propeller shaftswhich willbe constructed in such manner that the bearing and shaft maybe at all times lubricated so that the rotatable parts of the hearingmay move freely under the action of the shaft Furthermore, I aim toprovide a bearing of the type set forth which will embrace the desiredfeatures of simplicity, efliciency and durability and which may bemanufactured, installed and maintained at a minimum expense.

With the above and other ob ects in View, the invention consists in theconstruction, combination and arrangement of parts hereinafter set forthin and falling within the scope of the claim.

In the accompanying drawing, Figure 1 is a fragmentary longitudinalsectional view through the stern of a boat equipped with the presentinvention. Fig. 2 is a longitudinal sectional view through the bearing,and Fig. 3 is a transverse sectional View therethrough.

Referring now to the accompanying drawing in detail, the numeral 1designates the propeller shaft arranged longitudinally of a vessel andconnected at one end to a suitable engine or driving motor and havingthe opposite end thereof projected outwardly of the stern of the boatand equipped with the usual propeller blades. v

In the present instance, my improved stern bearing comprises a sleeve 2encircling the shaft 1 at the stern of the boat and provided at one endwith a circumferentially or otherwise fastened as at 4 to the inner sideof the stern and disposed concentrically of the opening through whichthe propeller shaft passes. The outer surface of the sleeve 2 adjacentto the forward end thereof is-circumferentially enlarged as at 5, whilesurrounding the sleeve concentrically thereof and spaced apart therefromis a second cylindrical sleeve 6 having the forward end thereof providedwith an inwardly extending flange 7 surrounding the shaft 1 andfastened-thereto through the medium 'ofa key 8 so that in the rotationof the shaft similar motion will be imparted to the sleeve 6. Theforward end portion of the inner wall of thesleeve 6 above thecircumferential enlargement 5 of the sleeve 2 iscircumferentiallyreduced as at 9 and such reduced portion cooperateswith the enlarged portion 5 of the first sleeve to form a race way forbearing rollers 10 or other anti-friction devices so that the outersleeve of the hearing will be supported by and capable of rotatingfreely about the inner sleeve.

Interposed between the inner and outer sleeves 2 and 6 respectivelyimmediately at the rear of the bearing rollers 10 is a suitable packing11, while threadedly engaging the open end of the outer sleeve andsurrounding the inner sleeve is a signed to compress the the shouldersformed by the circumferentially enlarged and reduced portions of theinner. and outer sleeves respectively and the innerend of the packingnut, while a jam nut 13 surrounds the packing nut and threadedly engagesthe same to hold such packing nut 12 against accidental displacement.

In the present instance, the flange 3 on the rear end of the innersleeve 2 is formed with an oil passage 14 communicating with a number ofpassages 15 formed in the inner sleeve and extending longitudinallythereof and spaced apart about the shaft 1, the forward extremities ofthe passages 15 opening into a common chamber 16 formed between theinwardly extending flange 7 on the outer sleeve and the confronting edgeof the inner sleeve, the passage 14 termipacking nut 12 denating at itsinner end upon the inner wall of the sleeve 2. By means of thisconstruction, it will be seen that the shaft 1 is at all timeslubricated so as to freely rotate within the sleeve 2 of the bearing,while the rollers 10 are at all times supplied with a lubricant so thatthe outer sleeve may rotate about the inner sleeve. In the presentinpacking 11 between,

stance, the key 8 is held against displacement by means of a set screw17 threadedly god in a bore in the Outer sleeve 6 and the inner endthereof bearing upon the key.

from the foregoing description taken in connection with the accompanyingdrawing, the construction, mode of operation and manner of employing myimproved stern hearing will be readily apparent. It will be seen that Ihave provided a stern bearing for water craft whereby the shaft is atall times held in proper line and capable of rotating with ease andfacility, while a fluid tight joint is eifected atthe point where theshaft leaves the stern of the vessel and enters the water.

I claim:

In a stern bearing, the combination with a propeller shaft, of a sleevesurrounding said shaft and rotatably receiving the same,

a supporting flange formed on one end of said sleeve, a second sleevedisposed concentrically of said first sleeve and spaced apart therefrom,an inwardly extending flange on the end of said last sleeve opposite theflanged end of the first-mentioned sleeve, a fixed connection betweensaid inwardly extendingflange and shaft, anti-friction bodies interposedbetween said sleeves whereby the last-mentioned sleeve may rotatewiththe shaft and about the first sleeve, a packing disposed within theother end of said last sleeve, and a packing nut threaded into thelast-mentioned end of said. last sleeve.

In testimony whereof I affix my signature in presence of two Witnesses.

JOHN B. STELZER. Witnesses: AGNES Znrnonnn, JAMES T. SANDERS.

